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J. DHOMERGUE.

Car Brake.

AMPHOTO-X ITHO. QJDINNJQSQDRNES PRDCESS.)

3 Sheets-Sheet 1.

Patented Dec. 20. 1853.

, h th J. DfHOMERGUE. 3 S 86 S S 2 'Car Brake.

v Patented Dec. 20. 1853.

AM. PHOTO-L ITHO. C0.N.Y (OSBORNE? PROCESS.)

3 Sheets-8heet 3.

V DHOMERGUE.

Patented Dec. 20, 1853.

AM- PHOTO-THU. GD- N.Y- NBBURNE3 PROCESS) floor of car removed.

. j acent parts.

UNI ED. STATES JOHN DHOi\IERGUE,

OF NEWV YORK, N. Y.

CAR-BRAKE.

Specification of Letters Patent No.

To all whom it may concern:

Be it known that I, JOHN DHOMERGUE, of the city, county, and State of New York, have invented a new and useful Improvement in Railroad-Gar Brakes; and I do hereby declare that the following is a full, I

clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, forming part of this specification, in which Figure 1 is a plan of the truck with Fig. 2 is a plan of truck frame with portion of car floor removed, showing the rods connecting the two trucks sup-porting the car. Fig. 3 is a vertical longitudinal section on line w 00 of Fig. 1. Fig. 4 is side elevation of the truck, showing connection between the two trucks of a car. Fig. 5 is a section of sheave and rubbers, perpendicular to axis of sheave, and on line m w of Fig. 1. Fig. 6 is a side elevation of sheave and block to which brake cams are bolted. Fig. 7 is a vertical section through axis of sheave taken on line 3 y of Fig. 6. Fig. 8 is a front elevation of sheave and ad- Fig. 9 is an elevation of tr1- branched ring, which gives motion to the brake cams.

Similar characters of reference in the several figures denote the same part of the machine.

The nature of my invention consists in the employment of hollow sheaves attached permanently to the middle of the axles, within each of which sheaves and detached from it, is a system of cams, moved simultaneously as hereafter to be described, and made to press against the inner periphery of the rim of the sheave, making aneifectual brake. I

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation.

In the drawings A is the axle with which the wheels W turn, in the middle of which 4 is fixed the sheave B which has the form shown in Fig. 7. On each side of the sheave B, and firmly secured by the pillar plates F, are the cast iron blocks D, to each of which is attached by the bolts G, the three cams U, each consisting of the iron arm and holder a and wooden rubber b. In the inner face of each block D is the rabbet 0, in which rests the slotted tri-branched ring R shown 1n Fig. 9, to the upper branch E of which, by the joint d, is attached the rod 0, the longi- 1o,33e, dated December 20, 1353-.

responding motion of the ring R in the rabface a stud H, secured in the cam by-a screw of the slots 7 of the tribranched ring R, as shown in Figs. 5 and 7, so that the motion communicated to the ring R bythe rod O is transmitted to the cams C, causing them to move about their attachments G on the block D, and the rubbers b to approach or recede from the inner surface of the rim P as required. The blocks D are so situated as to enable the axle A to turn freely within .them, so that when the rubbers are not in attachments have no connection with the running gear.

. There are on each side of every sheave connected as above described, each system being movable by ,a tri-branched ring R working upon the'block D. Each pair of arms E on the same side of the 'truck,.are connected by the rod 0, the longitudinal movement of which operates the cams with which said arms are connected. The rods 0 on'the same side of the twotrucks supporting a car are'connected by a rod Q attached at their middle points. The rubbers of the rear truck have the reverse posithe object of which will be hereafter described.

The operation of my brake is as follows:

row 1, Figs. 3 and 4t, and thesignal to brake being given, the screws S are turned moving the levers Z as indicated by arrow 2, and

rubbers of the cams O against the inner peder it, runs forward as indicated by arrow 1, causing its rods E by reason of the pressure of the rods Q, to take the direction and bringing the cams C closely against the inner periphery of the sheaves, this bet 0. Each ofthe cams C hason its outer contact with the sheave, the cams and their riphery of the sheaves, by means of the tribranched rings R as above described, stop pin almost instantly the front truck. The: rear truck which is so attached to the car as to have a smalllongitudinal motion "untudinal movement of which produces a corso, i 6; over each of these studsHas placed onej i B three cams constructed, arranged, and r tion of those used in the forward truck The car having motion as indicated by ar p drawing the rods T attachedto the rods 0 as shown by arrow 3; this movement off the rods 0 of the front truck'draws the shown by arrow 4, turning the rings R p of that truck in the direction of arrows 5,.

running together of the trucks presses the v shall be invariable, in which case the two rods T shall be so arranged in front that one shall be drawn forward and the other pushed back, thus tightening the cams upon one side of the sheaves in the fore truck and on the opposite side of the sheaves of the rear truck. This arrangement is dependent upon thesame component parts as that first described, the variation being merely in the device employed to bring the invention under the control of the operator, any of the Well known arrangements being applicable to produce the result.

. The distance between the rubbers and the inside periphery of the sheaves is not more than three eights of an inch when in What may be termed their normal state, consequently but little movement is required to bring them in contact With the sheave, stop its rotation and arrest the progress of the tram This brake can be applied to locomotives and thus enable the engineer to apply a by the action of the tri-branched ring R substantially as herein fully setforth.

New York, October 24th,,1853.

JOHN DHOMERGUE.

In presence of- ROBERT GALLAGHER, ALFRED DICKINSON. 

